let vm_pic = new Vue({
    el:"#header",
    methods:{
        addPic:function (num) {
            switch (num) {
                case 1:
                    location.href='index.html';
                    break;
                case 2:
                    location.href='index3.html';
                    break;
                case 3:
                    break;
                case 4:
                    location.href='index1.html';
                    break;
            }

        }
    },
})
